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     The _clear87 function returns the floating-point status word and
     sets it to zero, whereas the _status87 function returns it without
     change. The floating-point status word is a combination of the
     8087/80287 status word and other conditions detected by the
     8087/80287 exception handler, such as floating-point stack
     overflow and underflow.
 
     Return Value
 
     The bits in the value returned indicate the floating-point status.
     See FLOAT.H for a complete definition of the bits returned by
     _clear87.
 
     Many of the math library functions modify the 8087/80287 status
     word, with unpredictable results. Return values from _clear87 and
     _status87 become more reliable as fewer floating-point operations
     are performed between known states of the floating-point status
     word.
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